Remember you need a table code to use borders. Go back to the holidays page and cut and paste the one you see there.

To create a border you open a selection 100 x 100. Cut and paste your favorite picture in the selection or fill with colors of your choice and design using the flood fill, air brush and tool controls panel. Then apply a cutout or buttonize the image. Add a right border, make sure the box symmetric is unchecked. Do what you will to the border. I like a drop shadow effect here and I might use the color features to change the colors. Save the picture as a gif. That way you can use the original as a template for making buttons. Then select a color from the picture and add a border. I use 1000 on the right only.

As you can see the cat button was created from the border. I opened the border up and using the selection tool at rectangle I selected an area out of the border. Buttonize it and there you go a matching button.